Evaluation of Commercial Resolution Recovery Techniques in Four State-of-the-art Single Photon Emission Computed Tomography Systems Using a Digital Phantom Model

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  • Onishi Hideo
    Program in Health and Welfare, Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima
  • Motomura Nobutoku
    Division of CT & Nuclear Medicine, Toshiba Medical Systems Co.
  • Fujino Koichi
    Department of Radiology, Osaka University Hospital
  • Natsume Takahiro
    Faculty of Radiological Technology, Fujita Health University School of Health Science
  • Haramoto Yasuhiro
    Department of Radiology, Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital

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Other Title
  • 数値ファントムを用いた最新鋭SPECTの位置分解能補正の基礎的検討
  • スウチ ファントム オ モチイタ サイシンエイ SPECT ノ イチ ブンカイノウ ホセイ ノ キソテキ ケントウ

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Purpose: This study aims to evaluate the fundamental performance of four leading advanced resolution recovery methods. Method: To evaluate the performance of the resolution recovery algorithm, we carried out the computer simulation with the cone/sphere digital phantoms. These phantoms were used to investigate the basic properties of those algorithms. The software of four packages (advance) were also tested, specifically AstonishTM (AST), EvolutionTM (EVL), Flash-3DTM (FL3), and 3D-OSEM (3DOS). The performance was evaluated in the collimator systems (LEHR) reconstruction conditions using the full width at half maxi am (FWHM), aspect ratio (ASR), and artifacts of conical part. Result: In the “without BG,” FWHM of the advance method indicated a true-FWHM with SI (subset×iteration)=20, 40. As SI increased, FWHM was composed with over estimate. Each advances of FWHM indicated only 5% of improvement as compared with reference FWHM in the “with BG.” The ASR increased 20% to AST, FL3, and ASR of 3DOS remained in 10% in the outside. As for the reproducibility of the conical part, an artifact was caused by the FL3, EVL, and AST methods. This artifact did not occur in 3DOS. Discussions: An SI needs more than 150 to obtain an accurate compensation effect. As for the advance method, the major compensation effect was not demonstrated very much as compared with the OS-EM. The EVL, FL3, and AST overestimated values due to a Gibb’s oscillation in the artifacts of the conical part.

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